Step 1

Whisk together soy sauce, mirin, brown sugar, and vinegar in a large bowl until sugar dissolves. Reserve 1/3 cup of the marinade. Add salmon to bowl, mix well, and refrigerate 30 minutes.

Step 2

Preheat a grill to high (450°F to 550°F), or heat a grill pan over high, and brush grate with oil. Remove salmon from marinade. Thread sal-mon, bok choy, and scallions onto skewers. Brush with oil, and season lightly with salt.

Step 3

Grill, turning once, until bok choy and scallions are lightly charred in spots and salmon is medium within, 6 to 8 minutes. Transfer to a platter, and garnish with toasted sesame seeds. Serve with steamed rice and reserved marinade.